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;;; test-calendar-sync--expand-daily.el --- Tests for calendar-sync--expand-daily -*- lexical-binding: t; -*-
;;; Commentary:
;; Characterization tests for calendar-sync--expand-daily.
;; Captures current behavior before refactoring into unified expand function.
;; Uses dynamic timestamps to avoid hardcoded dates.
;;; Code:
(require 'ert)
(require 'testutil-calendar-sync)
(require 'calendar-sync)
;;; Normal Cases
(ert-deftest test-calendar-sync--expand-daily-normal-generates-occurrences ()
"Test expanding daily event generates occurrences within range."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(end-date (test-calendar-sync-time-days-from-now 1 11 0))
(base-event (list :summary "Daily Standup"
:start start-date
:end end-date))
(rrule (list :freq 'daily :interval 1))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-daily base-event rrule range)))
;; ~365 days future + ~90 days past = ~456 days of occurrences
(should (> (length occurrences) 300))
(should (< (length occurrences) 500))))
(ert-deftest test-calendar-sync--expand-daily-normal-preserves-time ()
"Test that each occurrence preserves the original event time."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 14 30))
(end-date (test-calendar-sync-time-days-from-now 1 15 30))
(base-event (list :summary "Afternoon Check"
:start start-date
:end end-date))
(rrule (list :freq 'daily :interval 1))
(range (test-calendar-sync-narrow-range))
(occurrences (calendar-sync--expand-daily base-event rrule range)))
(should (> (length occurrences) 0))
(dolist (occ occurrences)
(let ((s (plist-get occ :start)))
(should (= (nth 3 s) 14))
(should (= (nth 4 s) 30))))))
(ert-deftest test-calendar-sync--expand-daily-normal-interval-two ()
"Test expanding every-other-day event."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 9 0))
(end-date (test-calendar-sync-time-days-from-now 1 10 0))
(base-event (list :summary "Every Other Day"
:start start-date
:end end-date))
(rrule (list :freq 'daily :interval 2))
(range (test-calendar-sync-narrow-range))
(occurrences (calendar-sync--expand-daily base-event rrule range)))
;; 30 days / 2 = ~15 occurrences
(should (>= (length occurrences) 12))
(should (<= (length occurrences) 18))))
(ert-deftest test-calendar-sync--expand-daily-normal-consecutive-dates-increase ()
"Test that occurrences are on consecutive dates spaced by interval."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(end-date (test-calendar-sync-time-days-from-now 1 11 0))
(base-event (list :summary "Daily"
:start start-date
:end end-date))
(rrule (list :freq 'daily :interval 3))
(range (test-calendar-sync-narrow-range))
(occurrences (calendar-sync--expand-daily base-event rrule range)))
(when (> (length occurrences) 1)
(let ((prev (plist-get (car occurrences) :start)))
(dolist (occ (cdr occurrences))
(let ((curr (plist-get occ :start)))
;; Days between consecutive occurrences should be ~3
(let ((days (test-calendar-sync-days-between prev curr)))
(should (>= days 2.5))
(should (<= days 3.5)))
(setq prev curr)))))))
;;; Boundary Cases
(ert-deftest test-calendar-sync--expand-daily-boundary-count-limits-occurrences ()
"Test that COUNT limits the total number of occurrences."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(end-date (test-calendar-sync-time-days-from-now 1 11 0))
(base-event (list :summary "Limited"
:start start-date
:end end-date))
(rrule (list :freq 'daily :interval 1 :count 7))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-daily base-event rrule range)))
(should (= (length occurrences) 7))))
(ert-deftest test-calendar-sync--expand-daily-boundary-until-limits-occurrences ()
"Test that UNTIL date stops expansion."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(end-date (test-calendar-sync-time-days-from-now 1 11 0))
(until-date (test-calendar-sync-time-date-only 15))
(base-event (list :summary "Until-Limited"
:start start-date
:end end-date))
(rrule (list :freq 'daily :interval 1 :until until-date))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-daily base-event rrule range)))
;; ~14 days worth of daily occurrences
(should (>= (length occurrences) 12))
(should (<= (length occurrences) 16))))
(ert-deftest test-calendar-sync--expand-daily-boundary-respects-date-range ()
"Test that occurrences are within or at the date range boundaries."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(end-date (test-calendar-sync-time-days-from-now 1 11 0))
(base-event (list :summary "Ranged"
:start start-date
:end end-date))
(rrule (list :freq 'daily :interval 1))
(range (test-calendar-sync-narrow-range))
(occurrences (calendar-sync--expand-daily base-event rrule range))
(range-start (nth 0 range))
;; Add 1 day buffer — date-in-range-p checks date portion only
(range-end-padded (time-add (nth 1 range) 86400)))
(dolist (occ occurrences)
(let* ((s (plist-get occ :start))
(occ-time (test-calendar-sync-date-to-time-value s)))
(should (time-less-p range-start occ-time))
(should (time-less-p occ-time range-end-padded))))))
(ert-deftest test-calendar-sync--expand-daily-boundary-count-one-returns-single ()
"Test that COUNT=1 returns exactly one occurrence."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(end-date (test-calendar-sync-time-days-from-now 1 11 0))
(base-event (list :summary "Once"
:start start-date
:end end-date))
(rrule (list :freq 'daily :interval 1 :count 1))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-daily base-event rrule range)))
(should (= (length occurrences) 1))))
(ert-deftest test-calendar-sync--expand-daily-boundary-preserves-summary ()
"Test that each occurrence carries the original summary."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(end-date (test-calendar-sync-time-days-from-now 1 11 0))
(base-event (list :summary "My Event"
:start start-date
:end end-date
:location "Room 5"))
(rrule (list :freq 'daily :interval 1 :count 3))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-daily base-event rrule range)))
(dolist (occ occurrences)
(should (equal (plist-get occ :summary) "My Event")))))
;;; Error Cases
(ert-deftest test-calendar-sync--expand-daily-error-past-until-returns-empty ()
"Test that UNTIL in the past produces no occurrences in future range."
(let* ((start-date (test-calendar-sync-time-days-ago 100 10 0))
(end-date (test-calendar-sync-time-days-ago 100 11 0))
(until-date (test-calendar-sync-time-date-only-ago 50))
(base-event (list :summary "Past"
:start start-date
:end end-date))
(rrule (list :freq 'daily :interval 1 :until until-date))
(range (list (time-subtract (current-time) (* 30 86400))
(time-add (current-time) (* 365 86400))))
(occurrences (calendar-sync--expand-daily base-event rrule range)))
(should (= (length occurrences) 0))))
(ert-deftest test-calendar-sync--expand-daily-error-no-end-time-still-works ()
"Test that event without :end still generates occurrences."
(let* ((start-date (test-calendar-sync-time-days-from-now 1 10 0))
(base-event (list :summary "No End" :start start-date))
(rrule (list :freq 'daily :interval 1 :count 5))
(range (test-calendar-sync-wide-range))
(occurrences (calendar-sync--expand-daily base-event rrule range)))
(should (= (length occurrences) 5))))
(provide 'test-calendar-sync--expand-daily)
;;; test-calendar-sync--expand-daily.el ends here
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